Waldorf Edition - Manual (Page 20)

Waldorf Edition
User Manual 20 Waldorf
and the frequencies above are called the stop band range. The Attack´s filter dam-
pens frequencies in the stop band with a certain slope. The slope is 12dB per octave.
This means that the level of a frequency that lies an octave above the cutoff point
will be 12dB less than those frequencies of the signal that fall into the pass band. The
following picture shows the basic principle of a low pass filter:
Low pass filter principle
The Attack´s filter also features a resonance parameter. Resonance in the context of a
low, band or high pass filter means that a narrow frequency band around the cutoff
point is emphasized. The following picture shows the effect of the resonance para-
meter on the filter’s frequency curve:
Low pass filter resonance
If the resonance is raised to a great enough extent, then the filter will begin self-
oscillation, i.e. the filter generates an audible sine wave even when it does not recei-
ve an incoming signal.
Beside the low pass filter, the Attack offers the following filter types:
Type (Filter Types)
The following filter types are available when selected with the mouse:
 12 dB Low Pass Filter. Use this type if you want to create sounds with a
typical audible filtered character; for example, bass or lead sounds. With a
low pass filter you can shape bass drums or snare drums.
Frequency
Level
Cutoff
Frequency
Level
Cutoff
Resonance